<template>
  <div>
    <h1>当前求和为：{{ sum }}</h1>
    <h3>当前求和放大10倍为：{{ bigSum }}</h3>
    <h3>我在{{ school }}读{{ major }}专业。</h3>
    <select v-model.number="n">
      <option value="1">1</option>
      <option value="2">2</option>
      <option value="3">3</option>
    </select>
    <button @click="increment">+</button>
    <button @click="decrement">-</button>
    <button @click="incrementOdd">当前求和为奇数加</button>
    <button @click="incrementWait">等一等再加</button>
  </div>
</template>
<script>
import { mapState, mapGetters } from "vuex";
export default {
  name: "Count",
  data() {
    return {
      n: 1, // 用户选择的数字
    };
  },
  computed: {
    // 借助 mapState 生成计算属性，从 state 中读取数据。（对象写法）
    /* ...mapState({
      sum: "sum",
      school: "school",
      major: "major",
    }), */
    // 借助 mapState 生成计算属性，从 state 中读取数据。（数组写法）
    ...mapState(["sum", "school", "major"]),
    // 借助 mapGetters 生成计算属性，从 getters 中读取数据。（数组写法）
    ...mapGetters(["bigSum"]),
  },
  methods: {
    increment() {
      // this.$store.dispatch('jia', this.n);
      this.$store.commit("JIA", this.n);
    },
    decrement() {
      // this.$store.dispatch('jian', this.n);
      this.$store.commit("JIAN", this.n);
    },
    incrementOdd() {
      /* if (this.$store.state.sum % 2) {
        this.$store.dispatch("jia", this.n);
      } */
      this.$store.dispatch("jiaOdd", this.n);
    },
    incrementWait() {
      /* setTimeout(() => {
        this.$store.dispatch("jia", this.n);
      }, 500); */
      this.$store.dispatch("jiaWait", this.n);
    },
  },
};
</script>

<style>
button {
  margin-left: 5px;
}
</style>
